Thank you! Hot sails sounds intertesting but only RDM? Good to know that chinook and streamlined US-Cups are comartible! The chinook two-bold plate looks a little thicker and more plastic - even so this can be OK - just my impression by viewing the pix.

Does anyone tried to use a streamlined extension with an Neil Pryde X9 Wave? This Mast are a little tighter and I had experiences some Problems with fitting other extentions.